What? Who has told you contraflow is not attractive? Hahaha. That is ridiculous.
Sp/sx is attractive imo because they have this vibe "maybe i like you, maybe i dont" sneakiness, like a cat. Sx/sp is intense, but we know what we want and most people dont like when someone is too into them, especially not as fast as an sx first. Either people are attracted to us, or strongly repulsed by.